Question

A parallel plate capacitor of area A = 30 cm2 and separation d = 5 mm...

A parallel plate capacitor of area A = 30 cm2 and separation d = 5 mm is charged by a battery of 60-V
If the air between the plates is replaced by a dielectric of k= 4, but the battery disconnected before the dielectric inserted,
1) Find the capacitance of the capacitor.
2) What is the charge on the capacitor?
3) What is the energy stored in the capacitor?

please explain. Thank you

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